Circuit for a VCO and buffer that operates across the entire FM broadcast band (88-108 MHz). It doesn't require a tapped coil, it tunes very broadly, it's stable, and it has a nice, hot output.
This is just a variable oscillator based on a bf245 or k 161 fet. By changing the coil it can generate frequency between 0.5 and 300 MHZ. this circuit is useful to test radio circuit such as filter, receiver, transmitter and so on.
http://digilander.libero.it/alfred73/eprojects.htm#Gate Deep Oscillator
It is a Drain Dip Oscillator based upon a Wheatstone bridge circuit; the oscillator being one resistor of the bridge.
To vary the frequency of any sine-wave oscillator, you usually have to use a pair of ganged variable resistors, and you should thoroughly match their characteristics over the entire variation range to satisfy the oscillators balancing conditions. This res
A tutorial with circuit diagrams.
This circuit makes 1W output from a 2SK513 is power-Moss-FET
astable multivibrator, asymetrical multivibrator, complementary multivibrator, series multivibrator, emitter coupled multivibrator and more
high-performance op amps allows you to incorporate negatrons (synthesized negative resistors) into your oscillators and filters.